Attachable->IsRenderable step 2: Renaming AttachableComposite to RenderableComposite.

Review at http://gwt-code-reviews.appspot.com/1450804


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10215 8db76d5a-ed1c-0410-87a9-c151d255dfc7
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